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The best guy is Airpark Auto Service in the Airpark over in Giathersburg. The gentleman is a master Porsche Tech and just opned up his own shop. His prices are very reasonable and gives you very personable service. Will not gouge prices at all. his number is 301-519-0147
I had the PPI on my '89 Carrera done at Auto Sportsytems Group in Fairfax last Fall - 703 876 2811 - Very impressed w/ these guys - Really know their stuff.